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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financial Assets |  |  |  |  |
Derivative assets | $ 106,917 |  | $ 106,917 |  | $ 45,086
Financial Liabilities |  |  |  |  |
Derivative liabilities | 93,420 |  | 93,420 |  | 40,728
Impaired Loans [Abstract] |  |  |  |  |
Individually evaluated loans |  |  |  |  | 1,900
Provision (credit) for credit losses | 44 | $ (4,248) | (1,548) | $ 11,531 |
Recurring | Cash flow hedges |  |  |  |  |
Financial Assets |  |  |  |  |
Derivative assets | 13,497 |  | 13,497 |  | 4,358
Recurring | Freestanding derivatives, net |  |  |  |  |
Financial Assets |  |  |  |  |
Derivative assets | 93,420 |  | 93,420 |  | 40,728
Financial Liabilities |  |  |  |  |
Derivative liabilities | 93,420 |  | 93,420 |  | 40,728
Recurring | Level 2 Inputs | Cash flow hedges |  |  |  |  |
Financial Assets |  |  |  |  |
Derivative assets | 13,497 |  | 13,497 |  | 4,358
Recurring | Level 2 Inputs | Freestanding derivatives, net |  |  |  |  |
Financial Assets |  |  |  |  |
Derivative assets | 93,420 |  | 93,420 |  | 40,728
Financial Liabilities |  |  |  |  |
Derivative liabilities | 93,420 |  | 93,420 |  | 40,728
Nonrecurring |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Individually evaluated loans with an allowance for credit losses, Outstanding balance | 2,500 |  | 2,500 |  | 2,500
Valuation allowance | 1,300 |  | 1,300 |  | 600
Collateral dependent individually analyzed loans, credit loss release | 32 |  | 32 |  |
Provision (credit) for credit losses | 724 |  | 724 |  |
Nonrecurring | Level 3 Inputs |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Individually evaluated loans | 1,179 |  | 1,179 |  | 1,900
Carrying Amount | Nonrecurring |  |  |  |  |
Impaired Loans [Abstract] |  |  |  |  |
Individually evaluated loans | 1,179 |  | 1,179 |  | 1,900
Agency Notes | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: |  |  |  |  | 80,254
Agency Notes | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: |  |  |  |  | 80,254
Treasury Securities | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 231,880 |  | 231,880 |  | 244,769
Treasury Securities | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 231,880 |  | 231,880 |  | 244,769
Corporate Securities | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 141,196 |  | 141,196 |  | 152,030
Corporate Securities | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 141,196 |  | 141,196 |  | 152,030
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Mortgage-backed securities | 277,642 |  | 277,642 |  | 526,454
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Mortgage-backed securities | 277,642 |  | 277,642 |  | 526,454
Agency collateralized mortgage obligations ("CMOs") | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 321,881 |  | 321,881 |  | 521,258
Agency collateralized mortgage obligations ("CMOs") | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 321,881 |  | 321,881 |  | 521,258
State and municipal obligations. | Recurring |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | 35,158 |  | 35,158 |  | 38,946
State and municipal obligations. | Recurring | Level 2 Inputs |  |  |  |  |
Financial Assets |  |  |  |  |
Securities available-for-sale: | $ 35,158 |  | $ 35,158 |  | $ 38,946

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